NRG Study of an Inversion-Symmetric Interacting Model: Universal Aspects of its Quantum ConductanceReportar como inadecuado




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1 SPEC - UMR3680 - Service de physique de l-état condensé

Abstract : We consider scattering of spinless fermions by an inversion-symmetric interacting model characterized by three parameters interaction U, internal hopping t d and coupling t c. Mapping this spinless model onto an Anderson model with Zeeman field, we use thenumerical renormalization group for studying the particle-hole symmetric case. We show that the zero temperature limit is characterized by a line of free-fermion fixed points and a scale \tauU,t c of t d for which there is perfect transmission. The quantum conductance and the low energy excitations of the model are given by universal functions of t d-\tau if t d < \Gamma and of t d-t c^2 if t d > \Gamma, \Gamma = t c^2 being the level width of the scatterer. This universal regime becomes non-perturbative when U exceeds \Gamma.

Mots-clés : Conductance quantique interaction electron-electron algorithme NRG effet Kondo orbital systèmes mésoscopiques





Autor: Axel Freyn - Jean-Louis Pichard -

Fuente: https://hal.archives-ouvertes.fr/



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